dynamic if condition comparison of variables in javascript

Question

I've 3 variables a,b,c

The initial values of this variables will be 'false'

I want to compare this variables only have that 'true' value.

For example,

a=true,b=false,c=true.

So I need to compare like,

if(a && c)

if, a=true,b=true,c=true,

if(a && b && c)

How can I generate this if condition dynamically?

Are you looking to generate a string representation of the JavaScript code for that if condition? — techfoobar
– techfoobar, Commented Jul 17, 2014 at 6:52
What do you mean by dynamically? You can't (or shouldn't) generate code at runtime, there is almost always a better way. — jgillich
– jgillich, Commented Jul 17, 2014 at 6:53
If all variables you want, for example b and c, are true, what's the meaning of writing if (b && c) {...? since this clause will always pass. — rhgb
– rhgb, Commented Jul 17, 2014 at 6:54

Ja͢ck · Accepted Answer · 2014-07-17 06:58:01Z

5

I suppose you could approach the issue with [].every() which performs a similar comparison:

if ([a, b, c].every(Boolean)) {
    // etc.
}

Here, Boolean() is a native function that will accept a value and return its boolean value.

That said, just this will cover all cases too, considering that it uses short circuiting to stop the comparison once a false value is found and is undoubtedly easier to read:

if (a && b && c) {
    // etc.
}

answered Jul 17, 2014 at 6:58

Ja͢ck

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1 Comment

Alnitak Over a year ago

No need for isTrue - the Boolean function can do that for you - [a, b, c].every(Boolean)

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